DNS automation when deploying a VIP?

I see - the answer is no this is not a feature because the DNS is normally dealt with elsewhere in a large number of possible places but it's pretty simple with iControl REST. If you want to add a GTM record then you would use the relevant GTM url and add a wide-IP, and add the LTM virtual server as well. I won't bore you with how to do iControl REST but take a quick look on here and you'll be able to put it together yourself.